Car door lock device

The invention discloses a car door lock device. The car door lock device comprises a lock seat mounted on a car door guide rail frame, a door fastening device mounted on a car door hanger plate, a lock hook arranged on the door fastening device and matched with the lock seat, and a rotating arm type switch matched with the lock hook to act and mounted on the car door guide rail frame. The rotating arm type switch comprises a switch contact of an electrical safety device, a contact arm and a rotating arm module connected with the contact arm, the switch contact comprises a static contact and a movable contact, the movable contact is arranged on the contact arm, and the contact arm and the rotating arm module are both connected to the car door guide rail frame; the contact arm and the rotating arm module move synchronously; a hook part of the lock hook is connected with a push rod matched with the rotating arm module; and when the door is opened/closed, the push rod acts along with the lock hook, and the push r